Tendersweet Orange Watermelon Seeds
Tendersweet Orange Watermelon — Heirloom
Citrullus lanatus | 85–90 Days | Open-Pollinated
To truly appreciate this watermelon, you have to go back to where it all started.
Watermelons were first cultivated in the Kalahari Desert region of Africa thousands of years ago, where wild ancestors of the species grew with pale, orange, and yellow flesh — nothing like the red interior that grocery stores have trained us to expect. As the fruit spread north through ancient Egypt and eventually across the world through trade routes, orange and yellow-fleshed types remained the norm for centuries. Red flesh came later, the product of selective breeding. What that means is that when you grow the Tendersweet Orange, you're growing something that connects directly to the original fruit — older in its roots, truer to the species, and in many ways more interesting than what most people think of when they picture a watermelon.
The Tendersweet Orange is a classic cookout type watermelon in every sense — big, bold, and built for sharing. Fruits average 30–35 pounds with the familiar dark green striped rind you'd expect to see sitting on ice at a summer cookout. Crack one open and the interior is a deep, glowing orange — vivid enough to stop people mid-conversation. The flavor lives up to the look: intensely sweet with a smooth, honeyed quality and a subtle citrus undertone that red-fleshed varieties simply don't have. The texture is dense and crisp, and the flesh is remarkably tender given the size of the fruit, which is exactly where the name comes from.
The rind is thick and exceptionally tough — one of the sturdiest of any picnic watermelon — which means these fruits handle transport and storage beautifully. Farmers market growers love this variety for that reason, and home gardeners love it because a melon left on the vine a day past peak isn't a disaster. The vines are vigorous and productive, the plants adapt well across a range of climates, and the fruits are dramatic enough that people will ask what you're growing before you've even cut into one.
Bring it to the cookout, family reunion or party. It'll be the one everyone remembers.
When to Plant Like all watermelons, the Tendersweet Orange is a warm-season crop that needs warmth both above and below ground before it will perform. Wait until after your last frost date and until soil temperatures have climbed above 70°F before direct sowing. In shorter-season climates, start seeds indoors 3–4 weeks before your last expected frost to give the long season a head start — but resist the urge to start them much earlier than that, as watermelons develop fast and become root-bound quickly in small containers.
Starting Indoors Sow seeds about half an inch deep in individual biodegradable pots — watermelon roots are sensitive and the less transplant disturbance, the better. Keep soil temperatures between 80–85°F using a heat mat and expect germination in 7–10 days. Thin to the strongest seedling per pot once true leaves develop. Harden transplants off gradually over 5–7 days before moving them to the garden, and transplant on a cloudy day or in the late afternoon to reduce transplant stress.
Direct Sowing Sow 2–3 seeds about an inch deep per spot and thin to the strongest seedling once true leaves appear. Space plants 2–3 feet apart in rows 6–8 feet apart, or plant in hills spaced 6 feet apart with one or two plants per hill. These vines will fill that space and then some — give them room to do what they do.
Soil & Sun Full sun is non-negotiable. Tendersweet Orange needs at least 8 hours of direct light daily to develop its full sweetness and color. Loose, well-draining soil with a pH between 6.0 and 7.0 is ideal — sandy loam amended generously with compost before planting gives the roots room to push and the plants a solid nutritional foundation. Raised beds and mounded hills are worth considering, as they warm up faster in spring and drain well after heavy rains.
Watering Water deeply and consistently at the base of the plant throughout the growing season, keeping moisture even during vine development and fruit sizing. Once fruits have reached full size and are beginning their final ripening push, ease back on watering — this concentrates the sugars in the flesh and is one of the most important things you can do for peak flavor. Avoid overhead watering throughout the season to keep foliage dry and reduce the risk of fungal issues.
Feeding Work a balanced organic fertilizer into the soil before planting. Once vines begin to run, transition to a feed lower in nitrogen and higher in phosphorus and potassium to encourage fruit development over excessive vine growth. A light side dressing once fruits begin to set rounds out the season's feeding.
Harvesting Tendersweet Orange is ready to harvest when the small curling tendril nearest the fruit's stem has dried out completely and turned brown, and the underside belly spot has shifted from white to a warm creamy yellow. A dull, low thud rather than a bright ring when thumped is another reliable signal. As with all watermelons, the sugars stop developing the moment the fruit is cut from the vine — wait until it's truly ready. Use sharp pruners to cut the stem cleanly a few inches above the fruit.
The thick rind means these melons store and travel better than most, but for peak flavor and texture, plan to enjoy them within two to three weeks of harvest.
Saving Seeds Tendersweet Orange is open-pollinated and comes true from saved seed. Scoop seeds from a fully ripe melon, rinse them thoroughly to remove all flesh, and spread them on a screen or paper towel away from direct sunlight to dry for two full weeks. Store in a cool, dry, airtight container away from heat and humidity. Seed viability holds well for four to five years. Isolate from other watermelon varieties if saving for true-to-type seed.